150 lines
3.1 KiB
C
150 lines
3.1 KiB
C
/*
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* Copyright (c) 2000-2002, 2004 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: fclose.c,v 1.43 2004/08/03 20:17:38 ca Exp $")
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <setjmp.h>
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#include <sm/io.h>
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#include <sm/assert.h>
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#include <sm/heap.h>
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#include <sm/signal.h>
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#include <sm/conf.h>
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#include <sm/clock.h>
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#include "local.h"
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static void closealrm __P((int));
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static jmp_buf CloseTimeOut;
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/*
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** CLOSEALRM -- handler when timeout activated for sm_io_close()
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**
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** Returns flow of control to where setjmp(CloseTimeOut) was set.
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**
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** Parameters:
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** sig -- unused
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**
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** Returns:
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** does not return
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**
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** Side Effects:
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** returns flow of control to setjmp(CloseTimeOut).
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**
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** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD
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** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
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** DOING.
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*/
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/* ARGSUSED0 */
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static void
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closealrm(sig)
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int sig;
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{
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longjmp(CloseTimeOut, 1);
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}
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/*
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** SM_IO_CLOSE -- close a file handle/pointer
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**
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** Parameters:
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** fp -- file pointer to be closed
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** timeout -- maximum time allowed to perform the close (millisecs)
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**
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** Returns:
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** 0 on success
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** -1 on failure and sets errno
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**
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** Side Effects:
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** file pointer 'fp' will no longer be valid.
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*/
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int
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sm_io_close(fp, timeout)
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register SM_FILE_T *fp;
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int SM_NONVOLATILE timeout;
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{
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register int SM_NONVOLATILE r;
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SM_EVENT *evt = NULL;
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if (fp == NULL)
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{
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errno = EBADF;
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return SM_IO_EOF;
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}
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SM_REQUIRE_ISA(fp, SmFileMagic);
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/* XXX this won't be reached if above macro is active */
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if (fp->sm_magic == NULL)
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{
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/* not open! */
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errno = EBADF;
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return SM_IO_EOF;
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}
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if (fp->f_close == NULL)
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{
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/* no close function! */
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errno = ENODEV;
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return SM_IO_EOF;
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}
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if (fp->f_dup_cnt > 0)
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{
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/* decrement file pointer open count */
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fp->f_dup_cnt--;
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return 0;
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}
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/* Okay, this is where we set the timeout. */
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if (timeout == SM_TIME_DEFAULT)
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timeout = fp->f_timeout;
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if (timeout == SM_TIME_IMMEDIATE)
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{
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errno = EAGAIN;
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return -1;
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}
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/* No more duplicates of file pointer. Flush buffer and close */
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r = fp->f_flags & SMWR ? sm_flush(fp, (int *) &timeout) : 0;
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/* sm_flush() has updated to.it_value for the time it's used */
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if (timeout != SM_TIME_FOREVER)
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{
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if (setjmp(CloseTimeOut) != 0)
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{
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errno = EAGAIN;
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return SM_IO_EOF;
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}
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evt = sm_seteventm(timeout, closealrm, 0);
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}
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if ((*fp->f_close)(fp) < 0)
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r = SM_IO_EOF;
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/* We're back. So undo our timeout and handler */
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if (evt != NULL)
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sm_clrevent(evt);
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if (fp->f_flags & SMMBF)
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{
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sm_free((char *)fp->f_bf.smb_base);
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fp->f_bf.smb_base = NULL;
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}
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if (HASUB(fp))
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FREEUB(fp);
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fp->f_flags = 0; /* clear flags */
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fp->sm_magic = NULL; /* Release this SM_FILE_T for reuse. */
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fp->f_r = fp->f_w = 0; /* Mess up if reaccessed. */
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return r;
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}
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